Flatlander Mouths
short post but basically thinking about how they open their mouths used to bother me so i came up with this
closed mouth - all open mouth - half open mouth
Usually the all open mouth is for when they are ready to swallow the meal, half open would be usually to chew.
so there's little bones at the face angle that can slide back into the mouth/insides to "open". That's it. When fully open the beak parts join at the throat so that swallowing is only possible when the mouth is closed.
closed - full open - half open?
Women can do this crazy thing where, other than the usual beak movement, can 'unhinge' the jaw like a snake. They can probably do it with both, but its usually only one part of the beak that opens up like this. This is mostly to make birth a little easier.